Walker faces two counts of second-degree criminal possession of a weapon and criminal possession of a firearm.
The Nittany Lions scored seven unanswered goals.
Penn State suffers its first loss of the season in its first road game.
Penn State tallied 48 takedowns in its sixth shutout of the season.
The third baseman was named to the All-Big Ten Preseason Team.
Penn State shut Delaware out for the third time this season.